Recuperative furnace.



s. B. RUSSELL,

RECUPERATIVE FURNACE.

- APPLICATION FILED JAN. 15.19:].

1,25 1,,26. v Patented Dec. 25, 191?.

s. B. RUSSELL RECUFERATIVE FQRNACE. APP LICATIOH FILED JAN. I5, 1917.

192515426 Patented Dec. 25,1917,

@Q ZZ 2 SHEETS-SHEET 2.

UNITED? STATES rarrznr 0mm sue-s B. BUSSELL,-OF-ST. oUIsMIssoURI,ASSIGNOR To PARKER-RUsSEL MI Nm &

MANUFACTURING COMPANY,- or so. LOUIS, MIssoURI, A" CORPORATION orivns-SOUBI.

RECUPERATIVE FT'IRNACE.

Specification of Letters Patent.

ratefit'eanec, 25,1917.

Applicationfiled l'anuary 15, 1917; Serial-No, 142,431.

To (122mm it may concern:

Be it known that-L sims BENT RUSSELL, a citizen of the United States,residi'ng at St:- Louis, :Misso'uri, have invented certain new anduseful Improvement in Recuperative" Furnaces, I of which: the followingis a full, clear, and exact description, such as Willen'ableothers sk illed'in' the art to which it appertain s-to make and use the same; Thisinvention relates to recuperatiye fu rnaces, and particularly to-recuperative furnames of the ty-p'e" provided -With a :gas producer'orgenerator.

One object ofmy present invention is to provide a recuperat-ive furnaceof thegeneral ty pe referred to which-'is'equipped with means ofnovel'construction fo'r heating the primary air and injecting said heated:primary air mixed with steam into T the fuel chamber-of the: gasproducer insuch a manner 'th'at-there is little tendency for the fuel to="clin keror the fuel grate 'to burnout. Another object is to provide arecuperative furnacethat is-equipped with a novel means for heating theprimary' airthat' is supplied to the producer, said means-being sodesigned that the furnace as' an: entirety is compact and easy to buildAnd still another object 'is' to "providea gas bench of novel design, mwhich'the primary air is drawn through openings formed in the-front Wallof'the-furnace, then circulated through passageways that are-heated bythe Waste" fire gases escaping from the combustion chamber, andthereafter injected cable to various other types of recuperativefurnaces.

Figure 1 of the drawings is a frontelevational' View, partly in Verticalcross sect on,

of a .gas bench constructed in accordmice With my invention; 1

FigsQQ and 3 arevertical' se'ctionalrvieWs, taken on the lines a 22 and3 3, respectively,-of Fig. :1. 1

Fig. 4 -'s a fragmentary horizontal sec-.

tional View, taken on the line 4-4: of Fig. 1. Fig.2 5 isa=detailcross-sectional: View,

illustrating a slight modification of my invention and t Fig.6 is aperspective View ofone ofthe steam jets used to:in 'ectthe-heated-primaryair intothefuel chamber ofthe' producerr Referringto-the drawings: :Whichi illustrate a gas bench 'constructedin accordanceWith-my invention, A designates the fuel chamber ofthe gasproducer ofthe-bench, B- designates theretorts, C the combustion chamber 1 i and D'horizontallydisposed fire gas fines through whichthe Waste gasesfromthecombustion chamber travel in escaping to the uptake fiue 0r chimneyflue E, as indicated by the arroWs'inFigsZa. The fire gas flues D aresurrounded by air passage- Ways 1 through which the secondary aircirculates, so that said secondary air-Will be heated before it isadmitted to the "combusti'on chamber C, as'indicated by thearrows inFig; 1,-and the furnace is alsoprovided With means of novel constructionfor heating the primary air and inj'ecting'it mixed with steam :into thefuel chamber A of the gas producenln the formof my invention hereinshown said me'ansconsists of horizontally-disposed' fire gas flues D'that are arranged at the-opposite sides 1 0f the fuel chamber Aof theproducer beneath the fire gas flues D, primary vair passageways 2thatsurround the fire gas flues D' and steam jets or'inj'ectingr:nozz'les 3 arranged inalinement Withports 4 formed inthe-side Walls of the fuel chamber A-ofthe producer,"eitherabove'thefuel grate F, as shown in I ig, 1, -0r -=.beloW said -grate,

the arrows in Fig. 3, and thus heat'the primary air in the passageways 2that surround said flue D, and a horizontally-d1sposed partition 5 isarranged above the fiue D,

as shown in Figs. 1 and 3, so as to prevent the primary air thatcirculates through the air passageways 2 from mingling with thesecondary air that circulates through the air passageways l whichsurround the fines D. The primary air is admitted to the air passageways2 through openings 6 in the front wall of the furnace that are providedwith closures 7, as shown in Figs. 1 and 2, and each set of steam jets 3is mounted on a steam supply pipe 8 that extends inwardly through thefront wall of the furnace into the space that surroundsthe particularfire gas flue D with which it cooperates. l/Vhen the furnace is inoperation the jets of steam that escape from the nozzles 3 producesufficient suction in the primary air passageways 2 to cause the primaryair to circulate through same. Valves 9 are provided for regulating thesupply of steam to the pipes 8, and while any preferred type of steamjet may be used, I prefer to use steam jets of the kind shown in Fig. 6,each of which consists of a four-way pipe fitting 10 having twohorizontally-aimed openings into which the supply pipe 8 is screwed, alateral opening into which a plug 11 provided with an orifice 12 isscrewed and an opening on the underside of the same into which a plug 13is screwed, so as to form a sup porting leg for the fitting that restsupon a horizontally-disposed partition 14;, as shown in Fig. 2. Thepartition 14 extends longitudinally along one side of the fire gas flueD at a point above the inlet opening 6 in the front wall of the furnacethrough which the primary air is admitted to the air passageways 2 andbelow the ports 4 through which the primary heated air is injected intothe fuel chamber A of the producer, so as to cause the primary air whichis admitted to the space Or passageway located atthe inner side of theflue D to circulate clownwardly underneath said flue, thence upwardlyand over same to the ports 4, as indicated by the arrows in Fig. 1. Itis immaterial, however, so far as my broad idea is concerned, how thespace or passageways 2 through which the primary air circulates areformed,so long as they are of such 2 character that the primary air willabsorb heat from a fiue or fiues through which the escaping fire gasestravel before said primary air reaches the port or ports through whichit is injected into the fuel chamber A of the producer. It is alsoimmaterial what particular type of steam jet is used for forcing theheated primary air into the producer, but it is desirable that the steamjets be arranged in such a manner thatthe heated primary air will beintroduced into the fuel chamber of the producer at a number ofseparated points along the length of said fuel chamber. lVhen theprimary heated air, mixed with steam, is introduced into the fuelchamber of the producer through ports 4 in the side walls of saidchamber located at a point above the grate F, asshown in Fig. l, thetendency of the fuel to clinker and the grate to burn out is reduced toa minimum. If desired, however, the heated primary air mixed with jetsof steam can be introduced into the producer through ports 4: formed inthe side walls of the producer at points below-the grate F, as shown inFig. 5, thee-steam supply pipes 8 in such a structure being arrangedbeneath partitions 14* in the primary air passageways 2 which are soarranged that the primary air which is admitted to said passageways willcirculate upwardly over the fire gas flues D, and thence downwardlyacross the undersides of said fines to the ports P, as indicated by thearrows in Fig. 5. V

In order to eliminate the possibility of the primary air mingling withthe fire gases that escape from the fiues D and also to reduce the costof manufacturing and erectingthe furnace, I prefer to form the top andbottom walls and one of the side walls of each of the tines D, fromslabs of refractory material and form the other side of said fine fromspecial blocks or tiles m that are provided with open spaces andpartitions which are so arranged that when a plurality of said tiles arearranged end to end, as shown more clearly in Fig. 2, the partitions inthe same will cooperate to form the horizontally-disposed partition 14,previously referred to, and the spaces will form part of the passagewaythrough which the primary air circulates.

\Vhile my invention is not limited toa gas bench, it is particularlyadapted for use in gas benches onaccount of the fact that it enables acompact, inexpensive gas bench to be built in which adequate means isprovided for preheating the primary air and injecting said heated airmixed with steam into the producer.

Having thus described my invention, what i I claim, and'desire to secureby Letters Patent', is: g I I f In a gas bench, a gas producer, arecuperator provided with a fire gas flue and a space or passagewaysurrounding said flue through which primary air circulates, one side ofsaid flue being formed by blocks of refractory material having openspaces in the same that form part of said passageway, a division wallbetween said producer and recuperator that is provided with ports thatestablish communication between said producer and said primary airpassageway, and a steam supply pipe supported by said blocks andprovided with steam jets or injecting nOzZles arranged in proximity tosaid ports so as to cause the heated primary air mixed with steam to besupplied to the producer. SILAS B. RUSSELL.

Copies of this patent may be obtained tor five cents each, by addressingthe Commissioner 0! Patents, Washington, D. O.

